40 may be a little light...i got the wrong slow jets from Jets-r-us, so i had to drill my 35 out to what is slightly over 40...
..i can drill larger if needed...
..yeah, i gave 150 bucks for the whole shebang..cyl, piston/rings, pin/clips, head, pipe, fan, clutch, contra with these nifty lil ball-bearings...lol..
..itsa cheap one alright!!